LICHALP

Verrucaria umbrinula Nyl.

Lichenised. Poorly known taxon.

Substrate: siliceous rocks

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)

Note: a silicicolous species with a dark olive to blackish, granulose to scurfy thallus, black ascomata (to c. 0.25 mm in diam.), and oblong ascospores (to c. 20 µm long), based on a type from Northern Finland; from the Alps there are some scattered records, but conspecificity with material from Central Europe needs confirmation.